func writeImage(bkt s3mock.MockableBucket, filename string, m image.Image) error {
var buf bytes.Buffer
if e := jpeg.Encode(&buf, m, &jpeg.Options{Quality: 7}); e != nil {
return e
}
return bkt.PutReader(filename, &buf, int64(buf.Len()), "image/jpeg", s3.PublicRead, s3.Options{})
}
